Add to that your insurance company will get upset if you have an accident when using two winter tyres.
Is that true? Contrary to popular belief, insurance companies cannot easily void claims on trivial technicalities. Providing the tyre is legal and compatible with the wheel, they would have a difficult job refusing a claim.
Overall diamaters-you need the width of the tyre to calculate the overall diameter from aspect ratio.
Assuming 195mm width for both wheels:
15" +2*((195/25.4)*0.65)=25.0"
16" + 2*((195/25.4)*0.55)= 24.4"
The difference is 2.4%. As far as the speedo is concerned, not terribly important since it will under read by 5-8% anyway.
Edited by unthrottled on 15/12/2011 at 20:59
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